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(No Model.) '7

L. F. SHINNERS. SMOKE PREVENTING FURNACE.

No. 552,335. v Patented 13610.31, 1895.

INVENT u PE /zL SFMW ATT NITED STATES PATENT OFFICE;

LUKE F. SHINNERS, OF CLEVELAND, OHIO, ASSIGNOR TO THE AMERICAN SMOKELESS FURNACE COMPANY, OF SAME PLACE.

SMOKE-PREVENTING FURNACE.

SFECIFICATION forming part of Letters Patent No. 552,335, dated December 31, 1895.

Application filed July 26,1895. $erial No. 557,281. (No model.)

To all whom, it may concern:

Be it known that I, LUKE F. SHINNERS, a citizen of the United States, residing in Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Smoke-Preventing Furnaces; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

My invention has reference to smoke-preventing furnaces; and the invention consists in the construction and combination of parts, substantially as shown and described, and particularly pointed out in the claim.

In the accompanying drawings, Figure l is a vertical central longitudinal sectional elevation of the front part of a boiler-furnace embodying my invention. Fig. 2 is a crosssection of the furnace on line 2 2, Fig. 1. Fig. 3 is an enlarged section in perspective of a part of the tuyere, the air-supply pipe, and the magazine, as hereinafter described. Fig. i is an enlarged sectional elevation of the device for forcing the coal forward from the hopper to the magazine, and showing also a section of the operating-shaft for same.

The improvement shown in the foregoing figures contemplates the roasting or coking of the coal before-exposing it directly to the flame, and thus not only heating the coal to a combustible condition but eliminating its gases and smoke-producing elements and bringing the fuel to the point where perfect combustion is possible and smoke therefrom is prevented. To these ends I provide the furnace with a central bottom feed of fuel and supply air by blast at and through the initial point of combustion.

A11 ordinary furnace may 7 be furnished with my approved attachments or a new furnace be built therewith.

A represents what may be considered ordinary grate-bars supported at their ends in the usual or any satisfactory way, and B is a combined tuyere and grate-bar. Two of these bars B are shown here, running parallel with the grate-bars A and having the same end-supports in the bridge-wall C and the front wall D of the furnace. These bars or pieces B are each fashioned as plainly seen in Fig. 3. Along their bottom and center are grooves to receive the air-supply pipes E, and their inner faces or surfaces are rounded in cross-section from top to side to promote the feeding of the fuel and insure a more perfect operation. Longitudinally in the curved portion of each piece B is a slot '2 extending through to the groove 3 beneath, and a 1011- gitudinal overhanging lip or projection at forms a shed and protection to said slot against ashes and the like from above. Said pieces B are each further provided with short transverse grate-bars 5 extending inward from their inner edges, and thus preventing the formation of a dead-space at the center of the furnace where ashes would accumulate or the excessive heat might burn out the parts. Along the front of each piece B is also a downward and inward extending flange 6, running the full length of said pieces and formingengaging portions for the sides 8 of the trough-shaped magazine G.

The air-supply pipes B are supported a their ends in walls 0 and D, and air connec tion may be made with either end, as may be convenient; but in this instance the connection is at the rear through passage 9 in bridgewall 0, and connected by pipe 10 with the blower H. hen the construction herein shown is at work it is intended to use only the air-supply which comes through the channel just described, and, inasmuch as the blast is very strong, there is a constant tendency to keep clear and clean the slot 2 and pipe 3 from dust or other accumulations. The location of pipe E, as shown, beneath pieoe B, serves also to keep said pipe from burning out.

The magazine G is built into the furnace from beneath the grate-bars and pieces B, as shown, the sides thereof engaging in the flanges 6, as described. This magazine also extends out beyond the front wall of the furnace in a substantially tubular form, and a supply-hopper L feeds into this extension just outside the furnace-wall. Hence, when coal is fed into said hopper, it will also flow into said magazine and form a source of constant and regular supply; but in order that the coal may be carried forward in said magazine and forced up into the furnace, as required, considerable power is required, and such poweris supplied in this instance by the piston or conveyor. This conveyer is located in the tubular extension 12, and is caused to travel back and forth therein by reverselycut screw-shaft 14: working with its thread in said piston. Suitable gear connection is made at 16 with said shaft 1 L to rotate the same either way, as may be needed. Vhen the said conveyer-piston is in position about as seen in Fig. 1 the coal will begin to feed into the magazine, and when said piston has been fully withdrawn from beneath hopper L and a supply of coal is made the piston is forced forward by means of the power provided for that purpose, and the coal is forcibly carried forward, thus lodging the fresh coal at the bottom of the magazine and forcing the coked or heated coal up into the furnace. The bottom 18 of the magazine is inclined toward its rear end to facilitate this feed of the coal, and the sides 8 flare outwardly somewhat for the same purpose. These sides 8 are flush with the adjacent surface of the support 13, and while the lips at are deep enough to shed ashes from the opening 2 they do not materiallyinterfere with the feed of the coal. Then the coal is thus crowded forward into the furnace it distributes itself evenly along the trough of the magazine and rolls over upon the grate bars in a heated and combustible condition with the volatile gases already expelled and consumed.

What I claim is- The furnace described having tuyere B, longitudinally in its center andformed with longitudinal air inlet slots 2, transversely curved inner top edges termin atin g in guards 4 overhanging the said air inlet slots, and short laterally extending grate-bars 5 along the back of each side of said tuyere, and a separate air supply pipe supported beneath each side of the tuyere and provided with a slot corresponding to the slot in the tuyere, in combination with the magazine Gr having its sides supported along the flanges 0 of the tuyere and means to force the fuel in through the magazine, substantially as described.

\Vitness my hand to the foregoing specification this 15th day of July, 1895.

LUKE F. SI'IINNERS.

\Vitnesses H. T. FISHER, ALLIE ROBERTSON. 

